C = XCi+YCi+XYS = X⊕Y⊕Ci
C = A*B
______________
S = AB+AB = A⊕B
由這兩張圖中的波形圖可得知
___________F = A*B = A+B
也可以將真值表畫出來
固得証
___-___-______F = A B+A B = A⊙B
等同
________F = AB+AB = A⊕B
______F = A+B
______F = A*B